Grinding-machine.



I". M. FEBBRE.

GRZEMNQ MACHINE.

1,127,877. Patented Fab. 9, 1915.

mfwmd FREDERICK M. FURBER0F REVERE, MASSACHUSETTS, ASSIGNOR TO UNITED SHOE MACHINERY COMPANY, OF PATERSON,

JERSEY.

Specification of Letters Patent.

NEW JERSEY, A CORPORATION OF NEW GniDING-MACHINE.

Patented nel. 9, m15.

Application filed May 13, 1913. Serial No. 767,323.

7o all whom t may concern Be it known that I, FREDERICK M. FUR- izsn, a citizen of the United States, residing at Revere, 1n the county of Suffolk and State of Massachusetts, have invented certain Improvements in Grinding-Machines, oi: which the following' description, in connection with the accompanying drawings, is :i specification, like reference'characters on the draw-ings indicating like parts in the several igures.

K This invention relates'to 4grinding machines and particularly to machines for grinding the teeth of rotary cutters such as are use l1for trimming the edges of soles in thel manufacture of boots and shoes. (Tuttiei's 4,used for this and similar purposes are :circular in peripheral outline, and include-a 'plurality of evenly spaced teeth the ends of which are formed to present cutting edges that corres ond to the desired transverse contour of t e edge of the Work, I

and each toothI is backed off at a slight angle to the direction of its motion in order to give the clearance necessary to enable the i tooth to cut. H insharpening these cutters, the faces Aof some of the teeth are ground ..1nereover, that will perform the' grinding* 45V to a greater extent thanothers, it is obviousthat the diametrieal length of the teeth will be caused to vary correspondinnly and the true periphery ofthe cutter will not be maintained.- Such variation frequently occurs in practice, especially where the cutter is presented by hand to the grinding member, and cutters thus incorrectly ground tend to vibrate when in contact with the Work, and do not produce smooth' edges.. The general objectief this invention is to avoid such inaccuracyin the grinding of these cutters 4and to reduce a machine that will serve to grind all the teethl of the -cut- .ter .to a uniform extent and. inaintainthe teeth in correctly spacedrelation, and, one,

operation in'a rapid and effective manner.4 l

' With this end View I have devised "machine that includes, broadly, a grindingmeinbe'piind aniexnberl for supportin a cutter, with anovel arrangement for e ecting` relativelmovement oflvs'aid members to cause alternaeengagementl"and disengagement of the grinding lmember fand ruiter. I In" the preferredfariangemcnt the-:cutter is carried 'with the grinding member. ment also includes meansto vary the path bodily around the grinding member in a closed circular path and into and out of contact therewith, and novel means are provided to advance the cutter angularly to bring successive teeth into position to be ground when the cutter is out of contact The arrange- .of means for confining such relative movement to a predetermined path, With provision also preferably for other relative movement of these members to bring the grind- .ing member and the surface tor'be ground into the desired effective relation. The preferred construction embodies guiding means for directing the movement of the cutterso as to prevent Contact of the cutting edges of the teeth with the periphery of the grinding wheel and to bring the surface of a tooth to be ground-initially intoopposed relation to the-active 'face of the wheel Without malr-l ing firm Contact therewith, 'and provision for subsequently-moving the cutter to effectfirm engagement of the grinding member and the surface to vbe ground, a nd for finally withdrawing theV tooth from such irnr` engagement before the cutter has completed its traverse of the wheel.

.A further feature of the invention residesin novel means for -`warning theoper-` ator when'thelast tooth of the series basbeen ground, and preventing further operation ofthe machine VWithout special attenf tionrnlthe, part o,f;th e o erator, thereby preventing a-tooth ffrom".y eing ground a second time and assuring that all the teeth' shall be groundtola uniform extent.

' A still further featirreconsists in the provision of meanswherein` l,the operator isenabled-'to bring'the en ;tensup ort to rest with the cutter in operatiuerre ation-t0 the grinding member and move the cutter manually upon supipert to g'xindne Qa ies more of the teeth to any extent desired, such means being especialy useful where 1t is necessary to true the cutter.

These and other features or the inyention, including certain details of construction and (.'omhinutionsI of parts, will he descrilied.

with reference to an illustrative meclune and pointed 'out in the appended claims.

1Referring now to the accom anying drew ingsu which illustrute `a mee ine that consttutcs a preferred embodiment of the 1ny i'ention, Figure 1 is a front elevation ot' the end of which is secured o grinding wheel 10.

The grinding wheel is formed to present at portions adjacent to its periphery on the side next to the bearin (i a plane face 'upon 'which to grind the beet of the cutter. .Into the, rear end of the hearing il is adjustahly threaded a bushing 12 which forms al1 eX tension of the shaft hearing and is rovided indicated by the arrow oni/'Fig` with a recess in which rotatesia iametricftllyl enlarged end-portion 13 'of the shaft 8. With this construction the shaft may ro tstein the bushing member, but on adjustmerit of'the latter will he m'oved longitudinelly in one direction or the other, sous to vary the position of the grinding wheel with reference to the cutter for a purpose tolusubsequently eztplained. The pulley ll. by ir'rhi'oh the shaft is driven inthe direction l is mounted in tsuch manner as to permit te'longitudinel' mov'ement of the shaft their/through The standard 2 has projecting therefrom e'hraclret ld upon which is mounted to slide horizontally a frame 18 which serves to support the mechanism for presenting the cut tertothe notion of the grinding wheel. A screw 20 adjusta'hly threaded in the end of the bracket 1G, and a portion of the frame 1S is held in swiveled relation on e. reduced portion of the shank ox"v the screw, as shown y dotted .lines in Fig. 2, sosthat the frame pei-takes of the longitudinal movement of the screw and slides over the bracket 16 in one direction or the other when the screw is turned, this mechanism serving to very the path oiz movement of the cutter with reference to the grinding member-,as will he here' inafter pointed out. I

AThe portion 22 of the frame 18 serves to' provide an extended hearing for a rotary shaft 24, and upon one end of this shaft is secured, by means of a pin 26, a hollow arm or casing 28 which is mounted at one side rotatably upon n loess 30, the latter projecting from the 'frame 'and forming one extenmore?? sion of the shaft bearing. VOn the opposite e side of the fiume member is a hearing extension 3l upon which is clamped hy means of a bolt 32 a sleeve-33. Upon the forward end of the shaft adjacent to this sleeve is secured in adjusted position hy means of a vset screw 34 a crank 35 which is provided with u handle 3T3.

The arm carries nt its outer end a cutter support which comprises v:i hearing memlier 38 und e spindle l() mounted rotatably therein. The spindle is provided with a collar l2 that rests'upon the upper end of the hearing member 38, and is provided also at its u) er end with a conical seat portion he `spindle has secured upon its lower end n'sleei'e lf3 which serves to re- `tain the spindle in the bearing member. Formed centrally of the spindle is an opening provided with a threaded portion at its lower end and adapted to receive a removahle rod48 which has u correspondin ly threaded end portion. This rod is provi ed with n handle 50, and embracing the rod in permanently swiveled relation thereto, as

. shown, is a sleeve 52 which is split longitudinally at its lower end and is shaped to fit upon the conical portion 44 of the spindle. in the use of this device the rod is in sorted within the opening in the spindle and n cutter to he ground is passed over the hundle portion 5() and the sleeve 52 .until it rests upon the collur 4Z. By turning the handle 50 the rod muy then lie advanced' longitudinally within the spindle and the lower portion of the sleeve 52 expanded by sinon-ment over the conical member 14 so :is to hold the cutter firmly in the desired position. f

lt will be seen that the shaft 24 is positioned utone side of the center of the grind ing wheel and consequently on a rotation of the shaft, which takes place in a direction opposite to that indicated by the arrow ap- A'plied to the wheel, the cutter support and the cutter will he revolved bodily about the grinding wheel in u direction opposite to the direction of rotation of the latter and in :n path that traverses the wheel during a 'portion of the revolution of the cutter, us represented by dotted lines in Fig?. The cutter, us shown. is mounted upon the support in u plane transverse to the direction of movement of the support, and the grinding wheel projects.,iuto the path of move ment of the cutter n distance substantially equal to the radial depth of the teeth of the cutter. ln order to advance the cutter and bring the teeth successively into position t0 he ground, I have provided means which includes a wheel 54, preferably formed in tegral with the sleeve 46 and therefore rotatah'le with the spindle 40 and provided upon its upper side with teeth corresponding in number to the teeth on the cutter to iio be ground, and a pawl 56 which is advanced once on every revolution of the cutter sup port and h v engagement with the teeth on the wheel il serres to advance the spindle :and cutter the necessary distance to bring suer eding teeth into position to be ground. mean-s for operating the paul com stationary eccentric S formed on n ot the boss 3*? and a strap 6() which uned to the pani and embraces the ec '1 ne ifi-asl may he held in position gage theitceth of the wheel 5l by any t hlr ineens. ln the preferred consti-uo tif 'i shown the pawl magnetiaed so as to n22i-.umili its position in contact with the 'wheel 54, While friction of the strap 60 upon thev eccentric during the rotation of the shaft ifi contributes to the saine result.

The position of the eccentric is such that 'the cutter will be advanced when it is out of contact with the grinding member, the advancing movement terminating iortly before the cutter arrives at the position 'wwnf in Fig. In order to prewent the .ter vand itssupporting spindle from roff hacltwardly in `the bearing 38 any lle means may be provided, such means preferred construction shown coma Holton clutch represented at 62 lading a roller that operates upon griiery of the Wheel -L to prevent ird rotation thereof. i

l he seen that the mechanism for ad- Y tinv` cutter angularly is inclosed l the hollow arm 28 and a. portion of 38 `which projects as a casing wheel M. Such a, construction,

' in rievv of the .lirection of rotaiff cutter support in relation to the serves to protect the operaisla etica-tively from the dust d by the grinding operation, s or' special importance in this class lines. since the emery dust would be if permitted to work into the bearorder to assure that the teeth shall be i sht into firm contact with the ginding n .so as Ato grind them to the extent de- ;:nil at the same time to prevent the ting edges from being roughened when w hath malte or break engagement with the wheel. l have provided further means 'for di rect-ing' the movement of the cutter in i predetermined path. and for imparting du ng a rei-tain portion of the cycle of opinns lmrlily movement to the cutter in a lzansrerse to the general plane of *u fzround the wheel. .Vith this shaft ill i mounted so as longitrd movement in of the crank 3.3 is a projection G4 which carries a roller 66, and upon the periphery ol the sleeve 33 are formed a pair of guide members 68 and 70 which are spaced to receive the roller closely therebetween. These members are shaped at their end portions to maintain the roller in a normal plane of revolution about` the axis of the shaft 24, and are 'formed to present an intermediate curved 'guideway 72 that serves to effect a. movement of 'the roller and shaft 2i longitudinallyof the axis of the latter alternately towardjlle right and the left as the machine is viewed inr Fig.l 1. The guides are of such length and the crank adusted upon the shaft in such relation to the cutter support that the roller will enter the straight portion of the. gufideway immediately before the cutter arri ves at the position represented in the drawings, in its path of movement about the Wheel.y or prior to the time of possibleY` contact of the edges of the teeth with the grinder. The cutter vvill preferably he si mounted upon its support that when thiJ roller is between the plane faces of the guide members the face of the tooth to be ground shall be lightly in contact with the face ol the wheel. When the cutter, continuing its movement, arrives ata point where substantially `the entire surface to be ground is in opposed relation to the face of the grinding member, the roller reaches the curved por tion 79. of the ruidetvay and the cutter is moved bodily to bring the tace of the tooth into firm engagement with the Wheel so as to 100 grind it to the extent desired, Without disturbing in any manner the redetermined angular relation of the tooth to the face of the wheel, or the substantially parallel relation of the face of the Wheel and the surface 165 to be ground. Further movement serves to disengage the tooth from firm contact with the grinding member, this occurring before the cutter has receded radially from the f Wheel to any great extent; and the roller 1 10 finally leaves the plane portion at the other end of the guideway When the peripheral line of the cutter has fully cleared the grinding member. It will be evident that ivith this construction the faces of all the teeth will he fully ground to a uniform eX- tent at the saine angle in relation to the axis ofthe cutter, and that there will be no tendency to grind some portions of the surface more than others and consequently to 120 round or change the angle of the surface, nor any liability of bringing the cutting edge of :r tooth into contact with the peripheralV surface of the wheel. It is conceivable that the plane portions of the guides might 1315 be dispensed n ith. since the operator, as he stands in front of the machine with ref erf to the pi; ion shown in Fig. 1. naturally t i te maintain ther shaft 21. at the limit of movement toward the heft; but, it; prneiab 3 tft: wnstrnct the guides as shown sn P' make sure that the gnciing operanvn 'simil awwys, 'he Heated in the manner inten-fled n order tu Wnrn tiw tipiifratr when an he trvtii haw been ground sind to pren rent grinding a with :i seri-nd time, @have provided nwrlmnism inch incuds a Stop martima' 7% #tidiiie in :i what in the frame; 1a .ziltfi'hrg-i! tzwvzxrii the, path of lnovemfnt nf tliemittm-uppurt by n spring ha, Itop menxlner inning :i rmi Tv projo tf trough thi? traum with n lipari Fl* secured tlmreon whirl; .www tu mit t'iifw movement of the u', imp fri tw firvrtcaif irwntioned und is rimmed if; provide i im: tij, which the 0f." rr; muy mme? in@ #up in the npposi fi'mftima. f1. im; 2 'pri-rents, rotation of m stun member in :LN sunken The and of 2e) ti'ir :imp Tlf, is priiwidnd'wit-i a 510, indimti-ii by interi incis is; Fig. l, and at the rear if the slot? :is rien mi in this figure, the stop in '.igitiif mit :nwijv t thv and and is 'nvwiwl tsr'eii by' thv xlwfxtl H3 is a pin Si which. :it :1 unimi point in the rfw intimi if tin ifi.'ttm'wiurving spindle consequent upon the r'ewriutiun of the Support, mntnrf@ with the iwfi'ie-:l portion o1" the #nii '05', Lw smi; 'I anni? greening the latter :in backward siightiy 'in the .smaket Snaps into the sint in tifvan? n! the :imp member. This', 59PM m iwi; tin fitter :nippon se- "Hrvly in teiionufr puniliriin :ts shmvn in tim Jilin NingH when@ minuut be moved in 3f, itiuer flirwfiiin until riilvziased ti'roilgh retrmttimi ui' tive Stuga by mmms of the ug on tim member 5in "Tim general usiiiirieb' (if operation of the inwimri 'in thus im' ascribed have already in imm ix'idcutmt To grind i cutter, the dit vrzitor (im brings the Support into the inckvi pim on rciirescntvii n the drawings. Tin .simu/9 5i? haring bren oosened on the itonia maar 'Hr n witter is passed over the 4.3 ifandlv sind the shift, until it, restsaipnn that. foliar $2, Tiw nperntm' than turns the witter imtii ilk@ fait# mi' nrw #if its tenth unimi lightly with tht ginding fac@ of tw' iwi U", zijusiiing. if neizmirjyYt the glrmvr shaft sangtii rise in its bearings; my mmm of the @crew 12 so that the whee may iw in pzh/'Hr position ti grind i'h {wtn :it the rif-,mired nge; and than by turning thx 'imnrirf Sti he fur, the niet-ve 5.5 :'fJ fimnwxmi .w :m tu @nimmt its iower pnrtinn and imri thv witter seciireiy in piace., Sinni: tiiieffiwi'v un!! the. rod if are rvlatirey rmutziiie, the rmi wii be. turned within the Sliewfr mi the izstti'r wii be heid from tgirnng by i'rictifm upon itsy scat, therrbyfavoiding tiny tendent-y to turn the Cuttvr rmn thv dirw positinn 0f adjustment. The cutter having tuen secured in a non :is dmfband the screw 2U mgmpw ^`grind the. teeth successiyesy in the manner izatefi, if meccsnury, tn pmpnriy spaar the aiuti-1r with refewxiize tf tim periphery if iiw grinding nhv, the fiprator retracts the step 74 from aantast with the pin 9H und turns 'the shaft 24 by mffaim nf tim handle 36 so as to refroive the suppnri) and cutter about the grinding Wheel in a dirt@ tion opposite t0 the direction of rotation of the iatr, the merhnnisinoperaing to 'l5 pointed ont in the preceding description. AY'V'iifn the last tooth of the series has been groimrl the pin 8 wili iigag the stap 74 :ind Lock the. parts zigiin in stationr? psy ition If i'esired, ein trinf'ing whw :m E5 witter mny then be rimiljimvd find tine infr chine opt-.rated to grind the futter fr, 'secnn time.

It is snrnetime iwimhe w grind some i of the teeth m n cutter if; u. grenier @anni than others, particiavtv wher@ it. is runes:- sary to true the witten To infinie the 0peratnr to ziccomplish this re: "iiy, have provided maant; for riminmning the cutter Support :it rast. with the emitter in position 5m t0 makruli conautty with the grinding: member. This means 60m msm :i pawi 86 cnrrim by the casing 28 an ai nord: fmfnwd in the hws in the plane. nf mmninfent ai? the pawi no as' t pmvide im abutment,- 88 95 with which tiie'pawi wili @engage when the cutter is :it about the miedli; punit: of im trns'ersi of the grinding wheat, tim weight ot tin; prints tending m rijmt@ the :mn bank wardy and keep the pms@ in engeigrinnnt with the abutment. By turning 'tim insidia 5t? tbn cutter may then 'im wlen:-;ed, and the operator may munipwinti: ne cutter upon the sinora in :1 wei? knmv'n manner Si; :is tu grind any of the teeth 'to this extent desired.

Although I have dibcufid tn@ invention is embodied. in @machine having th@ spe #itis features of constrnctimi' Shown and de scribed, it. should be iinderstmie that ith@ inwntiun not thus restifiij-.ti in its n.2 plie-ation but that varimis orner emnntinwnts are Comprehemed within the spirit und scope. thcmof. Y

Having described the invention, what laim :is new :1nd desire to ,0 re by Lai-ters Patent 0f the Vnited States' the fumw mfg:N

L A machine of this dass described himing, in combination, a gring ineinwr, n inrmber for supporting :i fiittvr., nnf mmm whereby to move one of said members bodily in a closed path around the othtrz' f "number und timely adjzgcent to said other il mbar during a portion of said movement ivo eiecf V3i alternate engagement and disengaginnen: at the grinding member and the (intima l 2. A machine of tha class denarbed havingfm ombination, a grinding; memben hmu'ibfsrv finl suppnrting a Cattani and mms 1,135

'grinding member in a means `for carrying .whereby to revolve one of said members 3. .X machine of the class described havf ing. in combination, a support for a cutter, means whereby to revolve said support so as to more the cutter continuously in one direction in a closed path, and a grinding member projecting into the path of movement of the cutter.

et. A. machine of the class described having. in combination, a grinding member, means whereby to rotateI said member continuously in one direction.l and a support for a cutter, said support being movable to carry the cutter continuously around the direction opposite to the direction of rotation of said member and into and out of contact therewith.

5. A machine of the class described haw ing, in combination, a grinding member, a support" for a cutter, said support being mounted to revolve in a closed path around said grinding member so as to carry the cutter into and out of contact -With said member. and means for varying the position -oi the axis of revolution of said support with reference to said grinding member.

GA machine of the class described having. in combination, a grinding wheel. and a cutter in a closed path around said wheel and into and out of conn tact therewith, said means comprising an arm rotatable about an axis substantially parallel to the axisbf said wheel and interu secting said wheel Within the thereof and a spindle carried by said arm and iirranged to support the cutter across the plane ot the grinding wheel.

T. A machine of the class described having, in coi'nbination, a grinding member, means for carrying a toothed cutter bodily around said member and into and out of contact il'iereivitli. and means for eiiecting angular movement of said cutter when out marrant with said grinding member to into position to be H bring successive teeth ground. 'i machine of the ing. in cfmiliinatzon. a grinding member, a support for a cutter. said support being movable to carry the cutter bodily around the grii'iding member and into und out of contact therewith and rncludrng a rotatable spindle upon which thc cutter is mounted, means for r spindle to advance theuttcr n' i is out of contact with the gi y and means for shit "ng said si. Ait., c id its rotating means from tia dud o totgriudiug oper`- tion.

9. A machine ot class described haw mg, in combination, a grinding member, e

class described havperiphery hollow arm rotatably mounted at one side of said member, said arm carrying a casing at `the outer end thereof and a rotatable spindle mounted in said casing, said spindle having means for supporting a cutter to carry it into and out of contact with said' grinding member on a rotation of 'said arm, and mechanism for rotating said spindle to advance the cutter when the latter is out of contact with the grinding membe1,\said mechanism being arranged Within said hollovyY arm and casing and shielded thereby from the dust of the grinding operation.

10. A machine of the class described having, in combination, a grinding member, an arm rotatably mounted at one side of said member, a rotatable spindle mounted on said arm, said spindle having means for support ing a cutter to carry it into and out ot' contact with said grinding member on a rotation of said arm, and a pawl and ratchet device operative on a movement of said arm to rotate said spindle when the cutter is out of contact with the grinding member so to bring the 'teeth of' the cutter successively into position to be ground. A 1.1. A machine of the class described having, incombination, a grinding member, an arm rotatably mounted at one side of said member, arotatable spindle mounted on said arm, said spindle having means for supporting a cutter to carry it into and out of contact with said grinding member on a rotation of said arm, a ratchet wheel carried by "said spindle, a stationary eccentric, and means operated by said eccentric on a move ment of said arm to engage and rotate said ratchet Wheel when the cutter is out of contact With the grinding member.

12. machine of the class described hav? ing, in combination, a grinding member. a support tor a toothed cutter, said support being mounted for revoluble'movement to carry the cutter in one direction around said grinding member and into and out of contract therewith and including a rotatable spindle upon which the cutter is mounted, means for rotating the spindle a predetermined distance in one direction when the cutter is out of contact Withthe grinding member to bring another tooth into position to be ground, and means for preventing backward rotation of said spindle. A l5. A machine of the class described-hav'- ing. in combination, a grinding member.,a support for a cutter. said suppdrt being movable to carry the cutter into and out ot- Contact with the grinding member, and means constructed and arranged to maintain said support in a predetermined fixed posi-'. tion with the cutter in. position to contact with the grinding member. v

1/1.. .k machine of the class described llav-v ing. in combination. a grinding member,`an

arm rotatably mounted adjacent tol said `l11i member and having means fm' supporting a toothed cutter to cazry it into und out of Contact, 'with hv grixii'ling' nimniier :1s the` zum is minimi, :un minutes: fui' Siippiinir-if; :mid :ami with tim 'iiitifi' in iiiuiii'ig pas tfmii with i'iisiwci, 151 #xiii miiiiife," .i :is to permit mo'fciiwiii G5 tin? Cial'tfg with rf p :i fr iis wppm fm' grinding' be iii-wth ieieo imlepeiirhfniy mi ino'sifnmsi if said ami.

if. ."i mashine if thu 01:15:; aiesizzified han ing. in wmbinzition. i ri'iniug membem an :1i-ui mtaaiiiy mounted ijaffent l.: Said nicmim' and haring Hwang for snppfii' :L muerta curry itI into und ma: if ffoz'ii'aiff. Sidi the grinding mfembw n ihff mimi. and means; fm' sippm wth iii@ f-,zitiwr in grin-:iii if im pesi im siiiii uaiffzifiig e im immwii im, im :i 2me m" HW find :i pmi iecfrriw'l i i'zuig'm $1; mi; Said if. ein

E?. nmi'friirie m" the rfi di ribed hav im;v in :'zfiii'iiimifm, :j grinding mffibw. :i iaiipgm 'i ffii :i t'fvii'ztimfi animi, ma :y: i'vwiieiii' t@ lewin: amid mippm'tf mimi 'firms iofjnted ai; une side of the center @f the gg'imiiu memiwi td afin-y tinicmffi' im@ and am?, nf (mitm-1*, 'with the i'iiiii for; manning the mitei- :vijh I'ivspfft zu winnt Lf ms-:ant Lire L I: in Sui-fr M' the action fit? iie gfirieiizigg mvmw mums im shipping the i'evoiilms mi ffiifi Support whim ith@ ins 'tnmh uf Elie serias has been grmi'iid,

izziciirm n? the .f'i described han ing. in minifiimtimi. ii ,wup uit fm' a otned writer. insana imm-iig' to remise said upA pmi to curry tin. cutter int and out of con taci with the grinding member. means: for i'otntingf the rciitei with ivsperf; fr; the support to prv-mit the @wth in suwassion to the action mi tim grinding rimm'r'iefi. u, stop maur bm' on th@ fra mi of five isiuci'iiw. :and means wmf/alii@ ith said www and arranged. t engagie'ifiif stop ii'ifemiifi' :was liippose, mtiwr maven/mnt mi" @aid ssigfpfirt when the last oot'ii been ,wound 7.9i mm'iiine if 'm @3: i riwwi hav ing, in coini'iinziion. :i giirv;i1g frir-eiiiiier, sind i; memher for aiipgmitiiif; :i ciitiaix said mrfm bers having,pi'm'iioai 'for i'eiziw-f m-fivemsnt iiiitifiiij: t@ pffsiiigir iii@ :Nine i; 'e grinding member :1mi tim surf; .f ground in oppogad riaiaiun, anni, :liso for fatina' movment im eect'f. uniffrm ,relativa apprzmsh of iiai face of the grinding meub iwi and the sur-'face 1,0 be ground.

ik A m@ hm@ the. class described hav'- iiig. in zwiifiiiinzxtifuh n grinding member'. a iiwniwr ,fw supporting a mitten, Said members Em ving pim'iiou for relative moveiisent initiniiy tn position iiff active face af the grinding member and he .surface to be 4inwind in opgjmsed relation, and means for mie-@ting other rel-tive n'u'ivement of Said mmiiiimxs 'tu in'ng the cutter and grinding inefmiiifi into vn. mi'efzth e engagement with, fihi; :dwing Live singular if-.iniion of e Cim "mi if? @Hypoxi fm" a tocied ifirmfi. rid appart mung mmwi-ie tu ,h1-iig tin with-i' mtu @pen- :itive wintiou to the grinding member i, ,il tin: lhitter pmjQx-,ting Metingen adjacmit teeth if ine witter. and ziiitfiumtic :mums fm im parting nthffi mwmefnt to said suppm' to viiift fini! @r'igagfffment between :i tooth df Uw mitm' fumi said grinding member withmit. :iitiei'ing @he angular rei-ation of the out tw' tu the grinding men'ii-eix machine of the ciasS described having, 'in cmnbiimtimi, :1 ,grinding member, a rwatfiiiie shaft, n mippmt for a tmithd cm2t ter Cari'irfii, by said shaft and rotatable therewith tri bring: the Lutter into operative :"iatifin to ith@ grinding membF-i with the Latte:- picjwztiiig betwemi adacent teeth of the cutter, and means fm' e exiting longitudinal movement ot" the shaft virile the cutter and the grinding member are in said op erative grinding relation to l'uing the suriacc of the tooth to be ground in to firm engagement with the grinding member.

zo. A machine of the class described having. in combination, a grinding member, a rotatable shaft, a support for a toothed cutter carried by said shaft and arranged to bring the cutter into operative relation to the grinding member with the latter projecting between adjacent teeth of the cutter, a stationary cam, and means carried by the shaft in position to engage said cam to eflect longitudinal movement of the shaft whilethe cutter is ii said operative grinding relationso as to bring the surface oi the tooth to be ground into firm engage-- ment with the grinding member.

27. A machine of the class described hav-- ing, in combination, a grinding wheel, a support for a toothed cutter, said support being mounted Ytor revciuble movement to bring the teeth ot the cutter into grinding relation to the iaterai of the wheel, and means Vior guiding support in its nunement to prevent ement of the cutting edges of the i with the pe riphcral surface of the said means comprising a lined guide member and a, member movable with i support and armngvd to engage said lifted member.

28. A machine of the class described having. in combination, a grinding Wheel, a ro-.

tatablc sha'l't, a support for a toothed cutter carried by said shaft and arranged to bring the cutter, on rotation of the shaft, into operative relation to the grinding wheel with the surface of a tooth to be ground opposed to the l'ace of said wheel, and means for controlling the movement of said support to prevent engagement of the cutting edge ot' the tooth with the peripheral surface of the wheel, said means comprising a fixed guide and means connected with the sha t't and cooperating with said guide to control the longitudinal position of the shaft as the cutter approaches the wheel.

2S). A machine of the class described having` in combination, a grinding member, a support for a toothed cutter, said support being movable to cause the surface of a iooth to be ground to traverse in one direcl member.

30, A machine ol' the class described iia\ ing, in combination. a grinding member, i rotatable shaft, a support *for a toothed cut ter carried by said sha-tt and movabe on rotation oi the shaft to cause the surf-foie of a tooth to be ground to traverse the face of the grinding meml and means to: conA trolling said movement oi the. support comprising parallel guides and means eenzaam-d with the shaft and arranged to trave be- 7i; tween the guides to determine the loieitu dinal position oi the shaft, said guide ing an intermediate portion shaped to i: longitudinal movement of thc shaft so as to bring the surface to be ground into tieni en gagement with the grinding membY l A machine of the class described hat ing,` in combination` a grinding member, a member 'orsupporting a cutter, said im bers bein relatively movable to position the surface o the cutter to be ground in opposed. parallel relation to the face of the grinding member, and means for subsequently et fecting relative movement of said members in a direction transverse to the path ol" said. first named movement whiie maintaining said pa allel relation between the grinding member and the surface to be ground.

3Q. A machine of the class described hav ing, in combination, a support revoluble inv a closed path and having provision for mounting a toothed cutter thereon in a, plane transverse to the direction or movement of the support, and a grinding niember arranged to project into the path 'of movement of the cutter a distance substantially equal to the radial depth of the teeth of the cutter.

In testimony whereof l have signed my name to this specification in the presence of two subscribing witnesses, l

FREDEIHOK M. FURBER.

WVitnesses CHEs'rsa E. Roenes, RUTH E. WARD.

e if 

